more info!
In order to help you, we need to know everything possible. Save a specs file on your computer that you can post whenever you ask a question:
AMD 850 Mhz processor
256 megs sdram
Voodoo 3 3000 video card
Sound Blaster sound card
Windows 98
Project 64 1.4 using Jabo's Direct3D 6 1.4
Have that available EVERY time you post a question. Your problem could be a slow computer, a poor video card, incorrect settings or a bad rom. No one can guess without ALL the info